Securing means for striker-pneumatics.



M. CLARK.

SECURING MEANS FOR STRIKER PNEUMATICS.

APPLICATION FILED JULY 15. 1914.

Patented Feb. 29, 1916.

"outrun snares ra'rnnr err-res.

MELVILLE CLARK, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO MELVILLE CLARK PIANO COMPANY, OF CHICAGO, ILLINOIS, A COBPURA'IIGN OF ILLINOIS.

SECURING MEANS FOR STRIKE'R-ENEUIVIATICS.

. I Specification of Letters Patent. Patented Feb. 29, 12316.

Application filed July 15, 191e, Serial nb; 851,051.

TooZZw/wm it mag concern:

Be it known that I, MELviLLE CLARK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Securing Means for Striker-Prionmatics, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provice in an autopneumatic piano playing mechanism means for conveniently adjusting the stroke-communicating member of the striker pneumatic for accurate engagement of the part of the piano action upon which it is arranged to operate.

It consists of the elements and features of construction shown and described as indicated in the claim.

In the drawings 2-F igure 1 is a f0re and-aft detail section of a portion embodying this invention of a pneumatic action and of the piano action with which it engages. Fig. 2 is an inverted plan view of the motor pneumatic and striking member and adjusting devices thereon. lFig. 3 is a detail view similar to Fig. 1 showing a modified form.

The drawings show a familiar form of pneumatic action, having motor pneumatics, l, mounted in a plurality of levels or horizontal series aon shelves or transversely extending supporting bars, 2, and positioned for engagement of the moving walls, 1-, of the motor pneumatics with the stickers, 5, of the piano action. For engagement of said moving walls, at, with the stickers, the latter have as usual a projecting stud or )in, (3, and for engagement or encounter with these projecting studs or pins, the moving walls, l, of the respective motor pncumatics are each provided with a striking finger, 7, which is one arm of a bellcrank lever fulcrumed at 8 on the moving wall, i, of the motor pneumatic, and haw ing a depending arm 9, which is engaged with the rear end of an adjusting rod, 10. This rod is screwed through a bearing, 11, mounted on the under side and near the rear end of the moving wall, 1-, and is pro vided with an additional bearing, 12, on the under side near the forward end of said mo.ving;wall, 4; The 'end' ofthe shaft protrudes forward of said forward bearing,

12, and is adapted to be rotated by a key or screw dri .*er,most conveniently, the latter,for which purpose it has its end slotted at 13. It will be seen that by rotating the rod, 10, causing it to be screwed one way or the other through its rear bearing, 11, the bell crank, 79, is rocked about its fulcrum, causing the striker finger, 7, to be raised or lowered; and in this manner said striker finger of each mot-or pneumatic .2111 be adjusted into accurate relation with the stud or pin, 6, on the striker which it is to operate.

If desired, in order to avoid reliance upon gravity and the resistance of the piano hammer action for holding the depending arm of the bell-crank lever against the adjust .ing red, the latter may be provided with means for positively engaging said depending arn, consisting, as shown in Fig. 3, of spheroidal faced stops, 15, 15, screwed on to the end of the rod, 10, at opposite sides of the depending arm of the lever, the rod being threaded for that purpose. J am nuts, 16, 16, are preferably employed to prevent loosening of the stops.

It is desirable to be able to adjust the motor pneumatics longitudinally of the ac tion as a whole,that is, of the supporting shelves, 2,to bring the striker fingers into regist-ation with the stickers respectively of the piano action, these stickers being not spaced identically on different makes of aianos. For this purpose, the shelves, :2, are made narrower than the length of the fixed wall of the motor pneumatics, and are beveled. as seen at 2% and upon the ends of the fixed walls of the motor pneumatics which protrude beyond the lateral edges of the shelves there are mounted blocks, 20, having their edges toward the beveled edge of the shelf reciprocally beveled. These blocks are secured to the fixed walls of the motor pneumatics by screws, 21, taking into the holes of the blocks so positioned that when the screws are tightened to clamp the blocks to the motor pneumatic fixed walls, the beveled edges of the blocks clamp the beveled edge of the shelf and bind the motor pneumatics firmly to the latter; but upon slacking the screws, the grip of the clamping blocks, 20, is released, and the motor 'pneumatics may be re-positioned along the shelf as desired.

I claim In a pneumatic action, in combination with horizontal shelves for supporting motor neumatics, motor pneumatics mounted on said shelves extending crosswise thereof and protruding beyond the lateral edges of the shelves, said edges being beveled, and clamping blocks secured to theprotruding Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

